6: Option Cards
Equipment Required
The following test equipment is required for troubleshooting and adjustments:
• Oscilloscope (100 MHz bandwidth)
• Frequency Counter (10 MHz ±1 Hz)
• AC Voltmeter
• Spectrum Analyzer
• Phillips-Head Screwdriver
• Small Slot-Hear Screwdriver
• Small Non-metallic Coil Adjustment Screwdriver
Symptoms of a malfunction fall into three broad categories:
• No Output or Outputs
• Noisy Outputs
• Incorrect Frequencies
The possible causes for these symptoms are discussed by the following sections.
No Output Or Outputs
Before assuming a clock malfunction, first check that the instrument using the output is
functioning properly. Verify that all connectors are secure and coax cables are good. If at
least one output is functioning, the problem may be a bad option assembly.If all outputs have
failed, the problem may be a bad option assembly, a bad Backplane Bus Assembly, a bad
Processor Assembly, or bad connections between these assemblies.
Noisy Outputs
If the outputs are noisy or intermittent, the problem may be a bad option assembly, a bad
Processor Assembly, a bad backplane Bus Assembly, or bad connections between these
assemblies.
Incorrect Frequencies
If the frequency is out of specification, the system clock may have lost lock with the reference
source (i.e., GPS satellite signal) for a long period of time or the problem may be incorrect
firmware installed on the Processor Assembly.
Page 164 of 221 .................................098-00116-000 Rev. A
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